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Refactor dialog into static function where it can be reused by drag and
drop.

Event type name 'failed_plugin_vm_directory_not_shared' will also be
used by CrostiniEventType.

Remove FAILED_PLUGIN_VM_TASK_EXTERNAL_DRIVE error and only use
FAILED_PLUGIN_VM_DIRECTORY_NOT_SHARED which is slightly renamed.
FilesApp can detect when entries are in MyFiles volume or not and show
the correct message of move vs copy.

Bug: 1144138
Change-Id: I14072bcc3514f598428936dcad04b0468e432de8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2557819Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830856}